Mobile Diesel–Hydraulic Service Specialist

JARBO; St. Louis (MO); On-site; USD 55,000 - 75,000; Full time

Benefits offered by this job

Health benefits

Retirement benefits

Paid time off

Tools provided

Job summary

Sunup seeks an Mobile Diesel–Hydraulic Service Specialist to diagnose, repair, and maintain diesel engine and hydraulic systems in the St. Louis area. You’ll perform diagnostics, run tests, and ensure safe, reliable operation for customers while keeping thorough service records.

Expect field work with occasional shop days, travel across the region, and ongoing technical training to grow your expertise and career with an industry leader.

Qualifications

• Experience diagnosing and repairing diesel-powered equipment.
• Solid understanding of hydraulics—pumps, motors, hoses, cylinders, valves.
• Ability to read mechanical drawings, manuals, and hydraulic schematics.
• Independent field service experience at customer sites.
• Strong problem-solving and communication skills.

Responsibilities

• On-site troubleshooting, diagnostics, maintenance, and repair of diesel and hydraulic systems.
• Operate testing tools, inspect to isolate faults and determine root causes.
• Perform preventive maintenance and replacement of worn parts.
• Document diagnostics, work performed, and test results.
• Coordinate with customers and report findings clearly.

Skills

Diesel Engine Systems

Hydraulic Systems

Equipment Troubleshooting

Field Service Experience

Reading Schematics/Manuals

Job description

Mobile Diesel–Hydraulic Service SpecialistA Day On the RoadSunup finds you rolling out in a well-equipped service vehicle, headed to a customer site in the St. Louis metro area. A call came in about a pressure drop on a hydraulic circuit—by 8:00 a.m. you’re on the floor, gauges connected, reading the schematic, and tracing the issue to a worn valve. By midday, you’ve replaced the failed component, flushed the system, verified pressures, and documented the repair. The afternoon takes you to a second stop for scheduled PM on diesel-driven rotating equipment. You finish with a run-up test, brief the customer on findings, log everything in the work order, and head home. Some days you’ll stay over for a project outside the metro, but most nights you sleep in your own bed.What You’ll OwnOn-site troubleshooting, diagnostics, maintenance, and repair of complex mechanical equipment powered by diesel engines and hydraulic systems.Hands-on work with pumps, motors, bearings, shafts, seals, rotating assemblies, gearboxes, and mechanical drive components.Use of testing tools, visual inspections, service literature, and hydraulic schematics to isolate faults and determine root causes.Execution of preventive maintenance and scheduled services; identification of worn/failed parts and selection of appropriate corrective actions.Removal, repair, installation, and alignment of mechanical and hydraulic components.Startup, functional testing, and commissioning support after repairs or installations.Clear, professional communication with customers about equipment condition, recommended work, and maintenance plans.Accurate documentation of diagnostics, work performed, parts used, and test results.Independent field work with access to technical support when needed.Care and upkeep of company tools, service vehicle, and safety equipment; adherence to company and customer safety protocols.Where You’ll WorkPrimarily in the field supporting customers across the St. Louis region and nearby territories, with periodic work in the company shop. Travel is largely regional; most service calls end back at home. Occasional overnights occur based on project needs. This is not a full-time nationwide travel role.Backgrounds That Fit WellWe value mechanical troubleshooting above all. People thrive here from:Heavy equipment service and construction equipment repairDiesel engine repair and maintenanceField service or road technician rolesHydraulic service and industrial maintenancePumps, generators, agricultural equipment, and mobile equipment repairWhat Helps You SucceedProven experience diagnosing and repairing diesel-powered equipment.Solid understanding of hydraulics—pumps, motors, hoses, cylinders, valves, and related components.Comfort with mechanically complex systems and rotating equipment.A troubleshooting-first mindset (don’t just swap parts—find root causes).Ability to read mechanical drawings, manuals, and hydraulic schematics.Prior field service experience and confidence working independently at customer locations.Strong mechanical aptitude and practical problem-solving skills.Experience on our exact product lines is not required—if you bring solid diesel, hydraulic, heavy equipment, or industrial mechanical experience, we will train you on our equipment.Why You’ll Want This RoleCompetitive compensationComprehensive health benefits with medical, dental, and visionRetirement benefitsPaid time off and paid holidaysCompany-provided tools and/or service equipmentOngoing technical training and advancement opportunitiesStable, year-round workloadExposure to a wide mix of equipment and challengesYour Core ProficienciesEquipment TroubleshootingDiesel Engine SystemsDiesel & Heavy Equipment SystemsHydraulic Systems & ComponentsEquipment Diagnostics & TroubleshootingIf you enjoy solving mechanical puzzles, working face-to-face with customers, and owning your day in the field, this role delivers challenge, variety, stability, and a pathway to grow your career with an industry leader.